#leukocyte__leucocyte__whitebloodcell__white_cell__whitecell__white_blood_corpuscle__whitebloodcorpuscle__white_corpuscle__whitecorpuscle__WBC  blood cells that engulf and digest bacteria and fungi; an important part of the body's defense system
  supertype:  #blood_cell  #free_phagocyte
  subtype:  #myelocyte  an immature leukocyte normally found in bone marrow
  subtype:  #myeloblast  a precursor of leukocytes that normally occurs only in bone marrow
  subtype:  #lymphocyte__lymph_cell__lymphcell  an agranulocytic leukocyte that normally makes up a quarter of the white blood cell count but increases in the presence of infection
     subtype:  #B_cell__B_lymphocyte  a lymphocyte derived from bone marrow that provides humoral immunity; it recognizes free antigen molecules in solution and mature into plasma cells that secrete immunoglobulin (antibodies) that inactivate the antigens
     subtype:  #T_cell__T_lymphocyte  a small lymphocyte developed in the thymus; it orchestrates the immune system's response to infected or malignant cells
        subtype:  #helper_T_cell__CD4_T_cell__CD4_cell  T cell with CD4 receptor that recognizes antigens on the surface of a virus-infected cell and secretes lymphokines that stimulate B cells and killer T cells
        subtype:  #killer_T_cell__CD8_T_cell__CD8_cell  T cell with CD8 receptor that recognizes antigens on the surface of a virus-infected cell and binds to the infected cell and kill it
     subtype:  #lymphoblast  an immature lymphocyte
     subtype:  #plasma_cell__plasmacyte  a lymphocyte-like cell that develops from a B lymphocyte in reaction to a specific antigen; found in bone marrow and sometimes in the blood
        subtype:  #plasmablast  the precursor of a plasma cell
  subtype:  #granulocyte  a leukocyte that has granules in its cytoplasm
  subtype:  #monocyte  a type of granular leukocyte that functions in the ingestion of bacteria
     subtype:  #monoblast  a large immature monocyte normally found in bone marrow
  subtype:  #basophil__basophile  a leukocyte with basophilic granules easily stained by basic stains
  subtype:  #neutrophil__neutrophile  the chief phagocytic leukocyte; stains with either basic or acid dyes
     subtype:  #microphage  a neutrophil that ingests small things (as bacteria)
  subtype:  #eosinophil__eosinophile  a leukocyte readily stained with eosin

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